/*
 * *
 *    Copyright 2011 Baptiste Wicht & Frédéric Bapst
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 *
 */

package ch.eiafr.cojac.utils;

import ch.eiafr.cojac.Signatures;
import org.objectweb.asm.MethodVisitor;

import static org.objectweb.asm.Opcodes.*;

public final class BytecodeUtils {
    private BytecodeUtils() {
        throw new AssertionError();
    }

    public static void addSwap2(MethodVisitor mv) {
        mv.visitInsn(DUP2_X2);
        mv.visitInsn(POP2);
    }

    public static void addDup4(MethodVisitor mv) {
        addSwap2(mv);
        mv.visitInsn(DUP2_X2);
        addSwap2(mv);
        mv.visitInsn(DUP2_X2);
    }

    public static void callUserCallBack(MethodVisitor mv, String callBack) {
        mv.visitMethodInsn(INVOKESTATIC,
            parseQualifierId(callBack),
            parseMethodId(callBack),
            Signatures.REACT);
    }

    private static String parseMethodId(String fullid) {
        return fullid.substring(fullid.lastIndexOf('/') + 1);
    }

    private static String parseQualifierId(String fullid) {
        return fullid.substring(0, fullid.lastIndexOf('/'));
    }
}